Detachable tread member



B'. RUBIN April 2l, 1931. DETACHABLE Tamm maman Re' 18,054

Original Filed Aug. 29. 1927 www lx1-mauri;

I 9; ,gli 13 10 jg F19- 4 f 14 17 2 L4 Reimed Apr. 21, 1931 qUNITED STATES PATENT OFFICE :BENJAMIN RUBIN, OF PHILADELPHIA, PENNSYLVANIA., ASSIGNOR, BY DIRECT AND IIESNE .ASSIGNMENT T0 RUBIN PATENTS CORPORATION, A CORPORATION OF DELAWARE DETiACHALBLE TREAI) MEMBER `('h'iginal No. 1,696,058, dated December 18, 1928, Serial No. 216,188, `filed August 29, 1927. Application for reissue filed June 19, 1929. Serial No. 372,189.

The present invention relates to an improved detachable tread member particularly adapted for use in connection with any form of support, which may rest on or engage with the ground, and it has for its purpose to provide an article of this character which may be manufactured for a relatively low cost and sold at a reasonable profit.

The present invention has as another purpose improved means consisting of metal keepers U-form in cross section adjacent the margin of the base member, in conjunction with arched staples adjacent one end of the base member countersunk adjacent opposite ends -of a groove, which staples cooperate with similar staples and the first keepers with countersunk tongues carried by a tread member to be attached, a key to be inserted through the arched staples to lock the tread member in place.

It is to be understood that the particulars herein given are in no way limitive, and that while still keeping within the scope of the invention, any desired modification of details and proportions may be made in the construction of the invention according to circumstances.

The invention comprises further features and combination o-parts to be hereinafter set forth, shown in the drawings and claimed.

In the drawings:

Figure 1 is a sectional view through permanent base members and detachable tread members, showing the construction of the keepers and the arched staples.

Figure 2 is a transverse sectional view on line 2-2 of Figure 1, more clearly showing the construction of the keepers and the tongues engaged therewith.

Figure 3 is an enlarged detail sectional view through one of the keepers and one of the tongues.

Figure 4 is a cross-sectional view `through that portion of the base and tread members where the arched staples are used adjacent the grooves of the permanent base members and detachable tread members and showing the key in position.

Figure 5 is an enlarged detail sectional View through one of the base members and its tread member, showing the keepers and the tongues and the arched staples to receive the key.

Figure 6 is an enlarged sectional view through those portions of one of the base members and one of the tread members where the key is used for locking the tread member in position.

Referring to the drawings, 2 identifies a permanent base member, and fastened to the permanent base member adjacent its margin is a plurality of keepers 4, which are U-shaped and are countersunk in the underface of the permanent b-ase member. These keepers have sharpened or tapered sides 5, which are clinched at 6 on one side of the base member 7, thereby permanently attaching the keepers. The under face of the permanent base member has inclined grooves 8 leading toward the keepers, to guide spring tongues 9, which are carried by a detachable tread member 10 to be attached. The spring tongues are of an overhangin construction and are tapered, and are slig tly inclined, so as to possess the characteristic of drawing the tread member tight against the permanent base member. Each tongue has a sharpened shank which is driven through the detachable tread member to be attached and is clinched so as to retain the tongue in position at all times, even though the shank may bevsubjected to wear.

The face of the detachable tread member which engages the under face of the permanent base member is also provided with grooves 11 leading `up to and under the tongues to receive t e keepers, as they are engaged by the tongues.

Prior to attaching the tread member it is the purpose to apply a reasonable amount of adhesive such as composition of paraiiin and cement or the like to the face of the detach-A able tread member, and when the tread member is forced into position, the composition will spread a reasonable distance toward the edges of the members about its entirety and insure a relatively permanent seal between the detachable tread member to be attached and the permanent base member. Should any ofthe composition ooze beyond the face of the edges of the tread member, it may be burnished or wiped off to insure a flush and tight joint.

The rear edge of the detachable tread member is tapered as at 12, and engages under a portion of the permanent sole as at 13, there. being a requisite amount of similar composition applied at this point to insure a seal. Also the adjacent faces of thepermanent base member and the detachable tread member have registering transverse grooves 14 and 15, and countersunk therein `and adjacent their opposite ends are arched staples 16, which receive a locking .key 17, when thev tread member is placed in position.` The adjacent faces of the permanent base member. and the detachable tread member have inclined grooves 18 leading toward the arched staples, so as to receive the staples when the tread member is secured in posit-ion. The arched staples also have sharpened prongs which are driven through the permanent basel the cement, and then by imparting a sliding 3Q movement of thenew tread member` so as to cause the -tongues to engage with the keepers, and the arched staples tore'gister, a key may be inserted. The same action is used for `connecting the tread member 10 in Figures 5 and 6 to the permanent base lmember with the exception that the tread member 10 in Figures 5 and 6 is moved in an opposite direction, and due to this fact, the more the tread mem-l ber engages with the ground the tighter it may engage in position, provided no composition is used.

However, by this movement ofthe tread member to be attached, the tread member in Figures 5 and 6 is brought .tight to the permanent base member, and thereby causes the tongues andthe keepers to co-operate.

I claim Y 1. In a detachable tread member, a permanent base having on its under surface a plurality of grooves with their bottoms inclined slightly upwardly to'provide deepened portions 'with adjoining shoulders at certain ends of the grooves, keepers with'legs driven intothe permanent base having transverse Y parts overlying across said deepened ends,

` certain edges of the transversev parts being immediately adjacent said shoulders, a tread member'with angular tongues with said ends imbedded and fastened in one face ofthe tread'member with theirother ends tapered bottoms,` inclined,V whereby the transverse parts of the keepers'r may enter'the second grooves and the tapered portions of 'the tongue may cooperate with the under surface of the transverse part and the inclined bottoms of the first grooves to cause a wedging lock of the tongues with the keepers, said tongues and keepers cooperating to prevent movement of the tread member in one direction, and means for fastening the tread and base members together at one end to prevent movement in the opposite direction.

2. In combination with foot apparel hav-` ing a heel member and a tread member, keepers fixed on one of the members, each having a receiving portion spaced from the member to which it is attached, said `keepers being constructed of substantially rigid material, tapered tongues constructed ofthe same -material as the keepers fixed to the other vmember, having inclined surfaces for engaging the receiving portion of the keepers to co operate' therewith for attaching the tread member Yto the heel member, the distance between the keepers and the surfaces above the keepersbeingvarranged to cause the tapered tongues to have a wedgingaction when in engagement, and means to lock the tongues and keepers in wedged relation.

BENJAMIN RUBI.

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